Rocks of the Cañon City Basin Relative Thickness Age Formations ft (m) Lithologies Features Fossils Thicknesses 0 Poison Canyon 850 (259) granite and gneiss gravel, ft Formation (Tpc) start of Laramide uplift

Tpc Paleocene Raton (KTr) 240-500 river deposits Cenozoic Formation (73-152) ridge supporter

1000 KTr Vermejo (Kv) 150-750 dinosaur tracks and bones Formation (46-228) fossil leaves coal (swamp deposits) Kv Rockvale Trinidad 65 (20) (Kt) beach sands Sandstone palm Kt Castle Rocks storm deposits 2000 Baculites

Florence tepee buttes

3900 1950 ft gap 3000 Pierre Shale (1189) heteromorph (Kp) ammonites, ammonites marine lizards and fish Kp

Cretaceous 4000 black shales, mosasaur thin sandstones Cañon City Western Interior Seaway Mesozoic giant "dinner-plate inoceramid clams Smoky Hill platy chalks, Member 570 5000 (Kns) (174) black shales foraminifers Platyceramus

Niobrara "bowl-shaped" inoceramid clams Formation Fort Hays Member (Knf) 40 (12) limestone ledges Carlile Juana Lopez Member 233 (71) Cremnoceramus Shale (Kc) Codel Sandstone Member rhythmic limestone ledges Greenhorn (Kgh) 140 (43) Kn Limestone "winged" inoceramid clams 6,000 Graneros Shale (Kg) 115 (35) black marine shale

Mytiloides Skyline Road upper Dakota 110 (34) river to shore deposits, hogback Kg Glencairn Shale marine shales dinosaur tracks Kgh Plainview Ss 200 Dakota (61) white conglomerates Kc Group (Kd) Group Lytle Sandstone unconformity Cope quarry Kd 320 landslides Morrison (Jm) Formation (98) 7,000 Marsh-Felch quarry Jm Bell Ranch Stegosaurus Jurassic (Jbr) 150 (46) alabaster (bedded gypsum) Formation stenops Jbr unconformity

arkosic sandstones,

Permian granitic conglomerates Fountain 8,000 Formation 2000 Garden Park (PPf)I (610) 1000 ft gap Ancestral Rocky Mountains PPfI

lycopsid and sphenopsid tree trunks

Pennsylvanian

Paleozoic Williams Canyon Miss. Limestone (Mwc) 130 (40) few outcrops, highly eroded 9,000 unconformity Fremont caves Dolomite (Of) 300 (91) patch coral reefs Halysites Shelf Road Harding (Oh) Mwc Sandstone 100 (30) fish dermal plates, trilobites Manitou Of

(Om) bedded cherts, stromatolites Ordovician Limestone 65 (20) ( jawless fish Oh granodiorites p -Cgd, Great Unconformity Om Proterozoic and gneiss (p -Cgn 10,000 roots of mountains, 1.7 billion years old ft Compiled by Emmett Evanoff, 1996, modified 2006